Pin



Patented Apr 26, 1927.

HUGO KARL SAKOWSKI, 0F NEW YORK, N. Y.

PIN.

Application mea July 14, 192e. serial No. 122,397.

This invention relates to pins; and its object is to provide certain improvements of construction which impart to the pin the advantages both of an ordinary pin, such as smallness, lightness, cheapness and ready applicability forv various purposes, and of a so-called safety pin, such as reliability and absence of risk of accidents, so that the improved pin will be useful for domestic purposes as well as in the oiiice, shop and factory line. a

Ordinary `straight and smooth pins in general use for joining together cloth, letters, documents and the like are objectionable, since they frequently detach from the material and get lost and give rise to injuries.

My invention aims to remedy this defect by constructing a pin comprising a head and a shank in such a manner that the frictional surface efect thereof will be greatly in,q creased. According to my invention, the shank of the pin is bent to form a single locking portion and a single guiding portion which lie in the plane of the shank itself and which are respectively located comparatively near the head and point of the pin. These two portions are positionedat an angle to each other and to the axis of the shank, the extent of the angle formed between tlie first-named portion andthe axis determining the degree of locking action, so that by making the angle wider or narrower the locking action will be increased or decreased. The lookin portion is quite small land extends outwardly from the foot of the head end portion of the shank; whereas 'the guiding section, which is longer than the locking ortion, extends inwardly from the outer end of the latter portion to the upper end or top of the point end portion, the two main shank portions having a common axis.

The point end portion can be easily pushed through the material to be pinned, and the insertion of the pin can be continued until its locking portion has moved through the material, which is assisted, as will be understood, by the provision of the comparatively longer guiding portion. To with# draw the pin, however, an actual pull must be exerted on its head end in order to overcome the resistance offered to its movement by the angularly-positioned locking portion, and it is due to this resistance that any danger of the pin accidentally working its way out of the material is entirely obviated.

the locking and guiding porti/ons are quite short Fig. 2 is a similar view of a second form,

embodying a slightly longer locking portion and a much longer guiding portion;

Fig. 8 is a side view of a third form, in i which the locking portion is of approximately the same length as in Fig. l, whereas the guiding portion has an even longer length than in Fig. 2;

Fig. 4 is a cross-section on line 1 -4, Fig. l.

Referring more particularly to said drawings, it will be observed that the pin comprises four distinct portions or sections, viz :l a head end section 2, a locking section 3, a guiding section 4 and a point end section 5. The top section 2 is straight in theconstruction illustrated (though it may, of course, be bent or curved) and its outer end is shaped to form a head l; and this section, as

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well as the other sections specified, or any of them, may be of circular orV other 'ap-n proved cross-section. The lower or bottom section 5 is likewise represented as straight and as terminating in a -point 6, but may be bent or curved, and both it and the section 2 may have any desired length.

The locking and guiding sections 3 and 4 embody the most important features of my invention, and are designed to serve the purposes indicated by their respective names. The locking section is located at the foot of the head end section 2 and extendsoutwardly therefrom at an angle, as shown; and such angle, which is indicated at 7 and which will be termed the locking angle, may be varied at will within certain limits so as to regulate or adjust the resistance which it opposes to the withdrawal of the pin. In Figs. 1 and 3, the locking section 3, which is of virtually the saine length in both instances, is extremely short; whereas in Fig. 2 it is about twice as long as in Figs. 1 and 3. It may be made even shorter than in the first construction, or it may be given a greater length thanv in Fig. 2, accordin to conditions; and in like manner, the loe ing angle'7 may be made narrower or wider, as preferred.

y.The guiding sectionlt extends backwardly oi" inwardly from the lower or outer end of the locking-sectionrto the upper end of the point end section 5 and, like the section 3,

may be of various lengths according to circumstances. It should, however, in any case, be longer than section 3, and it should (whether straight or curved) lead back from the outermost point of that section to an extension or continuation of the axis of the head -end section 2; the last-named section and the other main section 5 preferably having a common axis. shown in Fig. 1, the guiding and locking sections have a ratio of about 3:1; inFig. 2, the guiding section is about three times as long as in Fig. 1, and in Fig. 3 it is about two l' and a half times as long as in Fig. 2. As

its name implies, the section 4 serves to guide the materials being pinned together to the locking section 3 during the insertion of the pin, and in this wayit facilitates the pinning operation.

Due to their inclination, it will be apparent that the sections 3 and 4 conjointly form a shoulder 8 at the foot of the locking angle which is offset laterally from the common axis of the main sect-ions 2 and 5--or,l

in other words, which projects outward from said axis; depending sections 3 and 4 and `their angular relation but also upon the size or extent', of the aforesaid locking angle. 1t is to be understood that both sections 2 and 5 may be curved while still maintaining their co-axial arrangement.

1n using the in, it is inserted in the usual way through t e pieces to be fastened ton the construction the extent of such osetting' not only upon the lengths of the gether, the inclined portion 4v guiding it therethrough while the other inclined por.- tion 3 offers no obstruction to such movement, so that it can readily be eii'ected.. On withdrawing the pin, however, the said portion 3 will tend to resist outward movement, and an actual pull must therefore be exerted with some force on the pin in order to cause the portion in question to pass through the material. Hence, this resistance, which can be adjusted by varying the locking angle, as previously1 explained, will entirely obvi'ate any accidental disengagement of the pin.

The invention as a whole may be regarded as a variation or development of that disclosed in my prior application, No. 120,188, filed July 2, 1926.

I claim as my invention:

1. A pin, embodying a shank which is bent to form head end and point end sections having a common axis,

Huso KARL saxowsxr.

whereof I affix my signature.

a single lock'-l ying section extending outwardly at an obtuse angle from the foot ot the head end the locking a 

